10121201021 has 4 divisors (see below), whose sum is σ = 10312167132. Its totient is φ = 9930234912.

The previous prime is 10121201003. The next prime is 10121201033. The reversal of 10121201021 is 12010212101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9343348921 + 777852100 = 96661^2 + 27890^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121201021 - 2¹⁰ = 10121199997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10121200993 and 10121201011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121201071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95482976 + ... + 95483081.

It is an arithmetic number, because the mean of its divisors is an integer number (2578041783).

Almost surely, 2^10121201021 is an apocalyptic number.

It is an amenable number.

10121201021 is a deficient number, since it is larger than the sum of its proper divisors (190966111).

10121201021 is an equidigital number, since it uses as much as digits as its factorization.

10121201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190966110.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10121201021 its reverse (12010212101), we get a palindrome (22131413122).

The spelling of 10121201021 in words is "ten billion, one hundred twenty-one million, two hundred one thousand, twenty-one".